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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54ede551b206018b632863938d4fafa7a1133dd4f77ec10f2dab2fb84d4218e2' 
  AND token = 'zjYezz+ROkhp5tS0brFGHnw5tL5yeeoB7tmjmBY469U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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