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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94f84916ab6467a8d1db6fa90bfc349e664890b38c9046d78f24cf2f6951e636' 
  AND token = '9u7B0cVEPuVdA1qoEH6J+XEiPdZECZEYqm0zmI4Fyvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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