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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ea210f4ae34428fd819430d0321c838b28c10ef79e17cfc445d37b4aa6efac9' 
  AND token = 'zp52twavbrEczRU6pCetukIEMPVLw8sa7bY/xmZrG/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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