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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '145d5208d5400f5c6a442fa2a452ed074f3811ce8cc42e989b298463c3f77740' 
  AND token = 'FKQTu4FwWS2ToQ9RIP+lxm4v/oku7w5tEHI29RPnC6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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