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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '053112c3e675505993f9d16625766c3b19a5c50254cc23a323419ab5f99c2be5' 
  AND token = 'i2M0eezQOoNvYgog92O2pn0UuFkI85q4dKZHYNQqvhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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