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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37dba92068fcbb66c2ae0ac8feecfe6e2493e229a539aa57f75b5c40cb2749e0' 
  AND token = 'wAJM86XI2I1mOmn8IWKl/968N/2GZz3kjVRz7Vs4yuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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