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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7df111f50806a4b77cbcc65f64639e59d637a6d3f5a44d9f8843921d8e7c95d2' 
  AND token = 'QfdDZ1R7W9N53mTYC4CkYrlHu53rh8LkO5YxRUZCRNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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