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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8f3f450ec4c01f7d909731b09049c22d4da794c9c56eb2c5b993daf2be4db37' 
  AND token = '12sr9J39XcNyBrQjFB9SLb/bN7HP0ZHqQwHbsITU0Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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