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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c1f161235a0c1e1bbe706e8613368065f9bc65d7c7dfc1e65252c3bc172c3b2' 
  AND token = 'emTjCM+yBKhA947hoieV6xkOUWjiltf510vUhgRz2nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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