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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bccd72620f54b3cd9247cd1ff23fbd049b3101c5f81989077a5b1e5fccfb2c62' 
  AND token = 'BDPnhC9Y3RMNWSnSDYgwOoDc77N0BALs1p7LBvKLNHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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