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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50596a5bf22af57ac40ede8bc283d3ccc20c5d889e2bd9a07e01540cc45ec75f' 
  AND token = 'lrE8vrRqC96eKWrVTdPqFyvpuIKMYe04kZGrQql95nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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