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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34c85191a40fd6eb8f7959f41706e8364de360c380e9394a6a75d55f64fd0a6d' 
  AND token = 'CeliN0ScygebQdAumGQqz3NECLmSHH8NpzMo/Iy3BM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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