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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '988b21b5605655e6c088482bd625e2459672dfdf25855dac71f53f793b16a50b' 
  AND token = 'Fwlvp6mZ3LSlpo0KIupoAwD7lIiEJVOuuyvFATcVX3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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