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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a263746b9ff0b105969462f3112a3aef7264eec918fb6d56874fe6af122d120e' 
  AND token = 'phHGLN8ylfTIFE1ctfjfudadHJ98Sv9l+TCfF86omfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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