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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44df5ae498b9d8b457b27c6f18246ca0970191c9f7dc53020077efcfadd1eb7f' 
  AND token = 'xdL8KBoJF7n8UCWbM21/N20Y0fBz5qSEvh5rs1wRo2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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