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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8003d0c16c82c42e38f7d6cecc18893a7600cb1185caa9c53ce187dc17c21ba' 
  AND token = 'r7u1K4jrgQ7cVoilK7KaFxH26uV9X2h/ix37Gk4mFr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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