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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0baef929f5b67490f4744612f7379c38deee3b5489146480d550f857bfbf2f9b' 
  AND token = 'SELvfbSqECYDoP2W6hMHZfSQcRSNOrQsPBfAMIhtNws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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