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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab754f98bb89f1ff507a3e7c3e7a2e73bc20e3b70a73483f9a3db0cda015154d' 
  AND token = 'tziuyqmB2JslowYrWaShm4lft1ofvHvF7YyhAdTkoz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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