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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad9e73ee26bf6f1609c52f7cd0d13313e0bfa3e069e13ede3c1a659df36011fd' 
  AND token = '0a2mJyQZOSWZq9WfuTOtOP16UIkaKUR7718GcmjqS28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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