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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3e172cb70b5537b4a547ed3419b9f6cb23e8db29f971029baca0c947eaaff7a' 
  AND token = 'aNE/27gQSnRKQ9uVwcj1Y0ukSatFYVc7Qaud0ujNjCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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