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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e85f64dcb13db9e5bfbb2ff6290e1c3edb177d1d1a65f8bd47b7899456d31722' 
  AND token = 'lvSZyAHLKbNDnlI4S3Jvju0eD2GlbuM45t69Ve8/1ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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