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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a02f8488739d8679173c08400434be43a28a6e45a5e7191eb2f54518b8e96da0' 
  AND token = 'r6zJe/ROXgLFamuhNxfbP/eb82kz1DdZJG392g/poHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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