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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dac1d9ab364ec9a2c9990e06cc6db71b1eed3408314a813d6797f8df423f34af' 
  AND token = 'oJx7UGjSR77w+Bo2WwOtbW4+ncOLDUr011X/DYsCuHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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