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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c659c32083be25c51f02c3a71be943e7da6551df95bee5e22c03ed7ffb2372c5' 
  AND token = 'N8I6lEFhqbd4BqjeBJ8yUrUB+RP6Plb9lVHdigAY0zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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