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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b9101e012c6d1081aee0504aeb51fb8a72df56586bae7f40e1506a3963e7c6f' 
  AND token = 'RB8u6z6vzdVtdsC9IR4DpEM+If1D6BAMVyk5kjtujjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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