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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b771c95b8d39f44dfe293a8c8d9c40fe4de7d69d45b8208369873c646db6625f' 
  AND token = 's7xGc3NdaayJVbBCecT46zw9+3Q36JzbsoaoXfs3hIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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