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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69c1e67efa2e99c93205aafa41a5c6555ad2fa06b60e35a5cc9ffaa9521bfbc8' 
  AND token = 'G4Su+VKP8b5kl09mjvod/slUoyTeN77dDdiE8h/7nvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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