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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3591f4a4970b950fb3f1db594091a33ae80e6d6f39f04bd4260cb4712e10dd5' 
  AND token = 'oqMFbzBqoJkyXyzxZcV2yvfndugPE0cdGai1WgsWHFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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