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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc0fabfba9a2113d7aa7bf6719c81a9e04db004396bf72e4ae1a80327eba67b2' 
  AND token = 'dC+EoHzVHBDk0VfB/hQnTpw7dw4ikNu3UjSO0f2oPjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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