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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b45f2aeca4e3e2f5ad6581082108e89bbd8337b90046d18e4dcd558c4653608' 
  AND token = 'bZB/s1dacYXAEpiDh08hwP3J6AsHo1LiWmhY4yhPQ98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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