SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed58766843b48498cb87ce712583f4f4fdd9ed0e2fa382ca96705a3a44e06a0f' 
  AND token = '0UBhRUIqPzu6G+2c4Kw4zx4BLhzGlgyzSCEglNi0hRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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