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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f20024963eb531fae0bbfd8205bdfde0999b5f16151d74ee6e5ce50580a59ebb' 
  AND token = '84j7O+xJkYenO5270B/iMZLTvJfl9XwPqxm4W4ibjc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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