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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3aa585a6b8c3074801bf4cee9f27081e26ee0e7feed21ca7230159b72fa4293' 
  AND token = 'MTvlbWJK1pRx0AhbaUYIX+XZvZ1GcaZlDBBTSxUkpNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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