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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16e955f077003775c68e13a3fae0708511f4a4778b7726f921824f974d883e53' 
  AND token = '0DkRVRqGy7iqkvevVg6LqGOverBSUqooCh0TnGGbWQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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