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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60fd218e2980b7bc41dae6ad119a920039ecf46cea67079202e3ed664bca14c8' 
  AND token = '/SRaJbRH8o2W5qkehVtFKFor2svxn89xM8ED3oxLvsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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