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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6cb28ec6b0149f237efee0e03b10535970e9ff6c2cf98b52a5ce9a3e0ec5168' 
  AND token = 'Rvhwkj+T3weTL6TM0GPBATevE4VK+dw2/lbjKeKs2rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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