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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6df550e052ac65b76df77b328bbefc68871e17f42da9ca00a34cc6f8604e575a' 
  AND token = 'O5Au2O/mLs/dxqLjp8birsgdqtV/mYUlscq91YC5O0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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