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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b0e17eaba410301e8533a5024ca0722f0def72e29d696fb8f1d05d67ee381f7' 
  AND token = '3vzjJk5qtRBZn8NfwP0S6DAlaxhm4GezZOLNfPxEY8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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