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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6962fbbaa5df70dc24e2ba673ac9e2de292d4cb128046ea8e2233215331f61e5' 
  AND token = 'yKyOTIl3EEz9lGofCjFO9Wq5I0mMMYKWkD1j7CUfnFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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