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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb55834790dc10b7acb769c4d17e62a2005e292a6486aaf890cfc7fd748ec457' 
  AND token = 'OzCZvQlC8biG1ROo9ea8jBmsF9qsG66yI1sxXOsOYO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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