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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d4e76ae1964f85917cd8b1265a10b0b8d89d518e85fa37c9ce9be87d1d6d22b' 
  AND token = 'gEAObUkXqw0oSc1Ko9XTSKwNgvQ2RixJ8/HOh0+W85c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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