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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0fc5feff6cc50813c5102aa5a4b7db132ab14ed143bb21873cc2aa6a702cbd6' 
  AND token = '83vIDp05sSx8BdFzsLDDVpI8QALBa0iVnPeCyWPLifE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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