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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '644926902f37169ac81bbef6799962a2c07615ca8e65c3dc1f80c2d1c3e1d30d' 
  AND token = 'YxGbCPz1ub1RNalAqIMa10Udil8gzndHfMiyTLjk6vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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