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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c667b2fc72725e42a688ff948e08a16d0b758fb5a92947baf5248a2061c66758' 
  AND token = '2IsG2x5M+8MmymsKPXrZUeLVpvD0t9+giHyovqyq+3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}