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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1d5973aebf9a3f7d3a20b3ddd1e8291d852214f9a7d6fbe95e73b3348d3eece' 
  AND token = 'ftzMhBHIAY52qNPLgx/27MLyHc+nd1xjiC+tO3go/Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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