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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87abe3f49e52b675cd2a9c15cd6cbf703987f73d2923d3bddce1ac0889aa2888' 
  AND token = 'MywN0jH0mffSHyI2r3MqHzMJLrbCr0gMi6TYO3GZZEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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