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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91b1b0404725f8a02087f2721fb86206138a51bcb04439ad38e9a3dde82a497e' 
  AND token = 'g5T6zvwG/LlbSWEOc/HO79qec/S0HH5aintxeZwsLnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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