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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6663ae3635ac714707098cc97913c8855779e0269d50a83c586a92ec6126d2a' 
  AND token = '3M/JgXyybRPgMvE/gtxcdArvtkebKL0XFdnf7OfYANc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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