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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '963f52491506c40942de7c34e7b83eb48388ca8d0662553872bc362d68b56066' 
  AND token = 'cwcSBJQl34KiYNjL4u0r4sN61XSJ/CtNCFfVnLQxmw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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