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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1975f3fad74c0d8c50465b000dc2837cc9887b4047e2e487811c1ca14370c02a' 
  AND token = 'xhB3pFQH/fnaUd52MZIvhW5S09MRdTpVAyf8TlqtySw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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