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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3f81c05ba9ba8e5262f4e09e37a4286eb7ee36e5299bfc2e2c54a7dfdca5af0' 
  AND token = 'UMRlhJpKFN2OFQkKcKgWV/0ovCrShI4hgaiXFHpONB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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