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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '553ce56f47f2d1f34e67dc33beecdde4b1cc6f53a660e51a4c4b7ceb5d3fd2cc' 
  AND token = '2hfqzRbKmkOprtoKM6PkmgVKDBAo4aHPcWzctuu1PZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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