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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8bce28b17f0d5b295372f94d4eef421812b366c7b0775298372ac83058954700' 
  AND token = '+pSaUf3slv8YlRh4DTxk0AXiNXNM4M8TkZ3xN/RyaGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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