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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fded74a1fbeeb68f3f7e18ee2fce14442a9f8a439cf4d632d843695b692f773' 
  AND token = 'yRSzq8JSVuEI4WsXeq/6KiWcazqE8EodrHL+mWW2eeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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